Straight-edge.



G. W. PENN.

STRAIGHT EDGE.

APPLICATION FILED 00113, 1013.

1,1 15,101 Patented 001. 27, 1914.

WITNESSES g nvmvmn 650/765 M PF/V/lf By van/V61 ATTORNEYS FFIGE.

GEORGE WILLIAM PENN, OF DALLAS, TEXAS.

srnnrennnnen.

Specification of Letters Patent.

Application filed October 1a, 1913. Serial No. 794,877.

To all whom it may concern:

Be it known that I, GEORGE W. PENN, a citizen of the United States, and a resident of Dallas, in the county of Dallas and State of Texas, have made certain new and useful Improvements in Straight-Edges, of which the following is a specification.

My invention is an improvement in straight edges, and has for its object to provide a tool of the character specified,especially adapted for paper hangers use, wherein mechanism is provided in connection with the straight edge, for compensating warping or bending, to permit the edge to be returned to its original straight condition.

In the drawings: Figure 1 is a perspective view of a portion of a straight edge constructed in accordance with the invention, Fig. 2 is a transverse section, and Fig. 3 is a partial perspective view with the compensating mechanism removed.

As is known, straight edges for paper hangers use, or for use in any situation where the straight edge is exposed to weather conditions, and especially moisture, the edge will warp or swell, and become distorted, so that it is no longer true.

With the present invention the straight edge will not warp so readily as the usual construction, and if the tool does become wvarped, means is provided for permitting the edge to be made again true.

The present embodiment of the invention comprises a bar or strip 1 of wood or other suitable material, of a suitable length, width and thickness, and that edge of the bar which in use will be the straight edge is provided with a groove 2, whose side walls are approximately perpendicular to the bottom wall. The groove 2 extends the full length of the bar, opening at the ends of the bar, as shown in Figs. 1 and 3. Within the groove 2 a bar 3 of brass or the like is arranged, the said bar beingof such cross sectional dimensions that it will fit the groove closely. The outer face of the bar 3 is flush with the edge of the bar 1, and a strip 5 also of brass, is placed over the bar 3, the side edges of the strip being flush with the side faces of the bar 1. t

for t The strip 5 is held in place by means of screws 6, and the said screws pass through the bar 3 and engage the bar 1 atthe bottom of the groove 2. The openings 7 for the screws in the strip 5 are reamed, as shown in Fig. 2, to bring the heads of the screws flush with the outer face of the bar. The openings 8 through the bar 3 are plain and the openings 9 in the bar 1 are threaded and are engaged by the threads of the screws to Patented Oct. 27 1914.

prevent displacement of the strip 5. The 1 bar 3 may be of any desired size, but it is preferably approximately square in cross section. The bar 3 not only reinforces the bar 1, but also acts to weight the bar at the straight edge. this purpose, and since it is this edge of the bar, namely the edge provided with the reinforcement along which the paper is cut, it will be evidentthat the additional weight will prevent slipping of the straight edge.

While the bar 3 and the strip 5 are preferably of brass, it is obvious that they might be of any other suitable or desired material, as for instance aluminum. The bar 1 may be of any preferred kind of wood, and the dimensions will depend upon the conditions the bar is to meet. The brass strip 5 prevents injury to the wood of the bar 1, during the cutting of the paper.

The improved straight edge will not readily become warped, but should this 00- cur, it is only necessary to loosen the screws 0, and to insert strips of paper between the strip 5 and the bars 3 and 1, until the bend ing has been compensated for, when the screws are again tightened.

With the improved construction, the operative edge of the straight edge maybe adjusted to one-thousandth part of an inch. The distortion with the improved straight edge will be small, and no particular skill is required to compensate for the said distortion.

I claim:

A straight edge comprising a flat bar of wood having in one of its longitudinal edges a groove, the side walls of the groove being approximately parallel, a bar of metal fitting the groove, a strip of metal arranged The strip 5 also assists in.

along the grooved edge of said flat bar, the openings for the screws in the strip being longitudinal edges of the strip being flush reamed to receive the heads of the screws. with the side faces of the first-named bar,

4 said strip and the metal bar and the Wooden GEORGE WVILLIAM PELIN' 5 bar ha ving registering; openings, and screws Witnesses:

passing through the openings to hold the ROBERT T. MEADOR, metal bar and the metal strip in place, the JACK J. MORAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents,

Washington, D. C. 

